Dealers in government and private securities need short--term financing to purchace newsecurities an carry their existing portfolios of securities until those securities are sold to customersof reach（ ）

A．business

B．markets

C．maturity

D．objective

金属加工设备对金属进行加工的方式有（）。

A.剪切

B.堆码

C.折弯

D.下料

E.切削